Finding Full Load Current & Torque in Induction Motors

In summary, the conversation discusses finding the full load current and torque in an induction motor problem. The speaker calculated the impedance in polar form but noticed that in the solution, only the magnitude of the impedance was used to find the full load current. They question whether the phase of the impedance is also necessary in this calculation. It is clarified that the amplitude of the current is based on the magnitude of the impedance, and the phase of the current is equal to the phase of the impedance.
  • #1
ranju
223
3
In an induction motor problem , I need to find the full load current & torque..for that I calculated the impedance with given data..& I got the impedance in polar form..But in the solution for finding the full load current they put only the magnitude of the impedance & not the phase..! I didn't get the reason actually ..maybe I'm missing some concept..Is it so that since we are calculating full-load current so only magnitude of the impedance matters & not its phase?.
 
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  • #2
It is when we calculate the amplitude of current we take into account the magnitude of impedance. So the amplitude(maximum value) of the full load current depends only on the magnitude of the impedance.

The phase at which the current lags the applied voltage is equal to the phase of the impedance.
 

1. What is Full Load Current?

Full Load Current (FLC) refers to the amount of current that flows through an induction motor when it is operating at its maximum rated load. It is the maximum current that the motor can safely draw without overheating or causing damage to the motor.

2. How is Full Load Current calculated?

Full Load Current is calculated by dividing the motor's power rating (in watts) by its voltage (in volts). This calculation can vary depending on the type of motor and its efficiency, so it is important to consult the motor's specifications for an accurate FLC value.

3. What is Full Load Torque?

Full Load Torque (FLT) is the amount of torque that an induction motor can produce at its rated power output and speed. It is a measure of the motor's ability to maintain its speed under a full load.

4. How is Full Load Torque determined?

Full Load Torque is determined by multiplying the motor's rated power output (in watts) by its speed (in revolutions per minute). This calculation can also vary depending on the motor's efficiency, so it is important to refer to the motor's specifications for an accurate FLT value.

5. Why is it important to know Full Load Current and Torque?

Knowing the Full Load Current and Torque of an induction motor is crucial for proper motor selection and operation. It ensures that the motor is not overloaded, which can cause damage and decrease its lifespan. It also helps to determine the appropriate circuit and wiring size for the motor, ensuring safe and efficient operation.

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